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(No Model.)

W. P. COLLINS.

DYNAMD ELECTRIC MAGHINERY.

No. 393,7 Patented 1360.4, 1 88.

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% ATTORNEY,

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UNITED STATES PATENT @rrrca.

FORMAN (TOLLlNH, OF NEW YORK,

DYNAMO=ELECTRiC WiACi-iiNEi-"il.

SPECIFICATION forming part of Letters Patent; No. 393,742, dated December 4, 1888.

Application filed September 24:, 1887. Serial No. 250,572. (No model.)

To all whom it may concern;

Be it known that I, \Y. FORHAN COLLINS,

resident of the city of Xew York, in the county of New York and State of New York, have invented certain new and useful Improve- 5 groove is made for each wire, and a small wail a sub ect of the Queen of Great l'lritain, and a ments in Dynamo-Electric Machines, of which i the following is a speciticzrtion.

My invention relates to certain improvements in the details of construction of dyname-electric machines or motors, which will be speeifical l y described in the following specification, and pointed out in the claims.

In the accompanying drawings, Figures 1 and 2 are respectively a plan and end elevation of my machine. Fig. 3 is a transverse section through the armature. Fig. iis a section through the pole-pieces and armature, showing the wire upon the core. diagram illustrating the electrical connections. Fig. 6 is a modification.

of my machine is illustrated in Figs. 1 and It .is formed of four cores, which are joined to form a diamond-shaped frame.

Each pair of magnet-cores A B are joined by bolts through their ends C, and are dovetailed into the pole-pieces P P, respectively,

so that there will be no contraction in crossductivity of the metal.

The )ole- )ieces arelaminated in a direction transverse to the shaft of the armature, so that there is no circulation of Foucault euris secured.

The armature is supported in bearings extending from the lower pole-piece on either side.

Fig. 5 is a i of iron is left between each two wires. 3y this means the wires are protected from injury and the iron. of the core brought into much closer proximity to the pole-pieces. In stead of the grooves, a series of longitudinal holes maybe made near the periphery and the wire wholly inclosed by the iron of the core.

The usual Siemens method of winding may be employed, instead of the arrangement shown.

\Yhat I claim, and desire to secure by Letters Patent, is

1. In a dynamo-electric machine or motor, the combination, with the armature provided with substantially semicircular grooves in its outer surface, ot the wire which forms the j winding of the armature, the said wire being wound only on the outside of the armature, Referring to the drawings, the field-magnet and a wire or wires being laid in each groove in such a manner that the said wires lie en'- tirely below the surface of said armature.

2. in a dynamo-electric machine or motor,

v the four cores of the field-magnets, each pair i of cores being bolted together at one end C,

and at the other end dovetailed to pole-pieces l. P, respectively, so as to form a diamondsection which will affect the magnetic con ing its bearings upon opposite sides of the lower pole-pieces and its periphery grooved ion git udinally, one groove for each wire,with a thin wall of iron between each two wires, subrents, and a better ventilation of the armature Itis of the drum-type and consists of i a series of plates, 1), fastened to the spiderE,

which in turn is carried by the shaft. The

armature-core is grooved longitudinally on its l stantially as described.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

W. FORMAN COLLINS. W itn esscs:

Wit. A. Rosario-inn, A'twafsrvs MERRITT. 

